Heating apparatus for shoe parts



Jan. 16, 1940. TEPPEMA Er AL 2,186,941

HEATING APPARATUS FOR SHOE PARTS Filed Aug. 22, 1938 2 Sheets-Sheet 1 Jan. 16, 1940. J. TEPPEMA El AL v HEATING APPARATUS FOR SHOE PARTS 2 Sheets-Sheet 2 Filed Aug; 22, 1938 24mm W 3M 1- tdbwwm e 4 Patented Jan. 16, 1940 UNITED STATES PATENT OFFICE HEATING APPARATUS FOR SHOE PARTS Application August 22,

12 Claims.

This invention relates to apparatus for heating a shoe and a cemented sole prior to their being brought together under pressure.

The object of the present invention is to provide improved means for heating a sole or a shoe bottom, for example, prior to their being brought together under sole-attaching pressure.

As illustrated herein, the apparatus comprises a heating element in the form of a long loop which, in plan, corresponds to the outline of a sole or shoe bottom and in elevation follows the longitudinal curvature of the shoe bottom, a suitable body portion or base being provided to which the heating element is attached. The body portion should be of non-heat-conducting material arranged to protect the part of the shoe which it is not desired to heat and to expose to the heat of the element that part of the shoe which it is desired to heat. The body portion may also have a surface disposed beyond the heating element with respect to the part to be heated to reflect heat thereon.

The nature of the invention will appear more fully from the following detailed description when read in connection with the accompanying drawings and will be pointed out in the appended claims,

In the drawings,

Fig. 1 is a side elevation of a sole heating apparatus constructed in accordance with the present invention;

Fig. 2 is a plan view of the apparatus shown in Fig. 1;

Fig. 3 is a transverse section on the line IIIIII of Fig. 1;

Fig. 4 is a side elevation of a shoe heating apparatus constructed in accordance with the present invention;

Fig. 5 is a transverse section on the line V-V of Fig. 4; and

Fig. 6 is a plan view of the apparatus shown in Fig. 4.

In an application Serial No. 226,146 filed of even date herewith, in the name of Jan Teppema, is described a method of making shoes in the practice of which the apparatus of the present application may be utilized.

The apparatus shown in Fig. l, which is adapted for heating a band of cement A on an outsole B supported on a shoe press pad C, comprises a heating element l0 and a body portion of non-heat-conducting material comprising, as

shown, parts l2, l4 and it, though the body portion may be made in one piece if desired. The part I6 has a marginal wall 18, preferably 1938, Serial No. 226,148

but not necessarily substantially perpendicular to the shoe bottom, following the inner margin of a band of cement applied to the outsole. The wall I8 is shown as of uniform height and serves to protect the central portion of the sole from the radiation of the heating element In. The parts l2, l4 and I6 of the body portion are shaped to conform approximately to the longitudinal curvature of a molded or conformed sole, and the lower surface of the part l4, which may be of metal, serves, since the heating element is disposed between it and the sole, to reflect the heat of the element l0 toward the cemented portion of the sole. It will be noted that in eflect the body portion is provided with .18

a rabbet formed by the surfaces l8 and 20, the rabbet following both in elevation and in plan the contour of the cement band on the outsole and the heating element being located in the angle formed by the two surfaces I 8 and 20.

The heating element I ll is preferably of a usual commercial type comprising a tubular casing 22, a central resistance wire 24 and a packing 26 between the wire and the casing of insulating material. The terminal portions of the heating unit may be provided with insulators 28 and the resistance wire 24 may be connected in any suitable manner to a source of electric current. The sole heating apparatus is provided with a handle 30 carried by a yoke 32 secured by a screw 34 to the upper end of a rod 38 having a reduced portion 38. Secured to the body portion I2 is a similar rod 40 which hasan upwardly extending reduced portion 42. A spring 44 is tightly coiled around the reduced portions 38, 42 of the rods 36, 40, respectively, and the intermediate portion of the spring 44 has its coil separated to provide circulation of air and to prevent conduction of heat to the handle. Braces 46 may be provided for the handle if desired. The handle 30 may be used to place the apparatus upon. the sole, to remove it therefrom and to suspend it when not in use. The heating element III is located in the angle between the surfaces l8 and 2|! and may be held in place by any suitable means such as wires 48 which pass through holes in the part 14. It has been found that if the heating element is arranged at the same distance from the sole around the toe as elsewhere the heating effect upon the toe portion will not be adequate, due evidently to the greater amount of radiations at that part of the apparatus than along the side. Accordingly, as shown in Fig, 1, the heating element Ill is bent downwardly slightly at the toe portion so that it will be nearer the cement to counteract the greater heat loss due to radiation at the toe portion.

The shoe heater, as shown in Fig. 4, comprises a supporting plate 50 the end portions of which are bent down to form legs 52 and 54 upon which the apparatus stands. Attached to the leg 52 is a gage 56 against which the toe end of a lasted shoe D may be placed to locate it properly with respect to a. heating element 60 which has substantially the same contour, both in plan and elevation, as the heating element Ill but which is arranged with its opposite side exposed so that its radiation may be directed toward the overlasted upper E on the bottom of the shoe D. Beneaththe heating element is a plate 62, preferably of metal, underlying the heating element 60 and serving to reflect its radiation toward the shoe, the surface of the plate 62 being curved to correspond to the longitudinal curvature of the shoe bottom. on the plate 62 inside the heating element 60 is a block 64 of insulating material, preferably of uniform thickness and having its side wall 66 curved in plan to follow the edge of the overlasted upper of the shoe D and thus to protect the central portion of the shoe bottom from radiation of the heating element 60. As in the sole heater, the element 60 is secured in the angle or rabbet formed by the surfaces 62. 66 by suitable means such as wires 68. Between the plates 50 and 62 a substantial thickness of heat-insulatin material such as asbestos is provided. In the I case of the shoe heater also it is found desirable to bend the toe portion of the heating element 60% toward the shoe to counteract the heat losses at the toe portion of the apparatus. The electrical connections may be made, of course, in the manner explained in connection with the sole heater.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

1. A heater for shoe parts comprising an exposed heating element comprising an electric resistance unit shaped to conform to the outline of a shoe bottom and adapted to heat the shoe bottom by heat radiation therefrom.

2. A heater for shoe parts comprising an exposed heating element comprising an electric resistance unit in the form of a long loop, the loop as a whole being shaped to follow the curvature of a shoe bottom both in elevation and in plan and adapted to heat the peripheral portion of the shoe bottom substantially solely by heat radiated therefrom.

3. A heater for shoe parts comprising an exposed heating element comprising an electric resistance unit following both in elevation and in plan the contour of a shoe bottom, and means exposing the marginal portion of a shoe part to direct heat radiation from said exposed element and confining the radiation of said heating element to the marginal portion of the shoe part.

4. A heater for shoe parts comprising an exposed linear heating element comprising an electric resistance unit in the form of a loop following both in elevation and in plan the contour of the marginal portion of a shoe bottom, and means for confining the radiation of said heating element to said marginal portion whilev exposing the said marginal portion of the shoe bottom to direct heat radiation from said element.

5. A heater for shoe parts comprising an exposed heating element in the form of a long loop, the loop as a whole being bent to follow the longitudinal curvature of a shoe bottom, said loop being also bent to follow the marginal portion of a shoe bottom, and a support for the loop adapted to engage the central portion of the shoe bottom and protect it from radiation of the heating element, the marginal portions of the shoe bottom being exposed to heat radiation from said heating element.

6. Apparatus for selectively heating portions of shoe parts comprising an exposed heating element in the form of a loop bent to follow in elevation the longitudinal contour of a shoe bottom and in plan view to follow the contour of the overlasted upper on the shoe bottom, and means for supporting said element at a uniform distance from a work-piece to expose the work-piece to heat radiation from said heating element and to protect the interior portion of the workpiece from radiation of the heating element.

7. Apparatus for selectively heating portions of shoe parts comprising a body portion of nonheat-conducting material having about its periphery a rabbet, one surface of the rabbet following the longitudinal contour of a shoe bot--v tom and the other surface of the rabbet following the inner edge of an upper lasted over an insole, and an electric heating element secured in' the corner of the rabbet.

8. Apparatus for use in heating shoe parts comprising a body portion of non-heat-conducting material having a. surface the longitudinal contour of which corresponds substantially to the longitudinal contour of a shoe bottom, said body portion having an adjoining surface arranged to follow the contour of the inner edge of the lasting allowance of a shoe upper, and a heating element located in the angle between said surfaces.

9. Apparatus for selectively heating portions of shoe parts comprising a body portion of nonheat-conducting material having a surface the longitudinal contour of which corresponds substantially to the longitudinal contour ci a shoe bottom, said body portion having a surface of uniform width arranged perpendicular to the first-mentioned surface and arranged to follow the inner edge of an upper lasted over an insole, and an electric heating element following the contour of both surfaces.

10. Apparatus for selectively heating portions of shoe parts comprising an exposed heating element in the form of a loop bent to follow in elevation the longitudinal contour of a shoe bottom and in plan to follow the marginal contour of the shoe bottom, and means for maintaining said unit at a uniform distance from a shoe part, protecting the interior portion of the shoe part from radiation of the heating element and exposing to direct heat radiation from said element the interior portion of the shoe part.

11. Apparatus for use in heating shoes comprising a body portion of non-heat-conducting material having a surface the longitudinal contour of which corresponds substantially to the longitudinal contour of a shoe bottom, said body portion having an adjoining surface arranged to follow the contour of the overlasted marginal portion of a shoe upper, and a heating element located in the angle between said surfaces, said first surface acting to reflect heat uponthe marginal portion of the shoe bottom and said second surface being of a width to spacethe heating element from the overlasted upper and acting to screen the central portion of the shoe bottom from radiation of the heating element.

12. Apparatus for use in heating shoe soles comprising a body portion of non-heat-conducting material having a surface the longitudinal contour of which corresponds substantially to the longitudinal contour of a shoe bottom, said body portion having an adjoining surface arranged to m follow the contour of the inner edge of a band 

